Dear all
Sorry if this is trivial............
I have a data set involving 3 groups of subjects (2 different patient
groups and 1 control group) doing a simple ABABAB style paradigm. I
have made a con* image representing the difference between A and B
for each subject. I can do a within group analysis by feeding the con
images for one group into a 1-sample t-test and I can compare 2
groups using a 2 sample t-test. What I would like to do is compare
all 3 groups. 3 pairwise comparisons would seem to be the best I can
do in "basic fMRI models". I assume it is more elegant to mdel all 3
groups in a single analysis. But PET multi-group models seem
to need one image PER CONDITION rather than one image per subject
representing the difference between conditions. Is there a way round
this without generating spm98 style "adjmean" images for each
condition?
NB: the number of subjects is not the same in each group if this is
relevant.
Many thanks
Rebecca
Dr Rebecca Elliott
Neuroscience and Psychiatry Unit
Room G907, Stopford Building
University of Manchester
Oxford Road
Manchester
M13 9PT
Phone: 0161 275 7433
Fax: 0161 275 7429
e-mail: [log in to unmask]
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